Basic sizes, tolerances, allowances and limiting sizes for Unified screw threads from Number 0 (0.060 in diameter) to Number 12 (0.216 in diameter) for Unified fine threads, Number 1 (0.073 in diameter) to Number 12 for Unified coarse threads and Number 12 for the Unified extra fine thread.Cross References:BS 93BS 919:Part 1BS 1580:Parts 1 & 2 BS 3382BS 4084Incorporates the following:AMD 1344 published 15 January 1974AMD 2783 published 15 March 1979PD 5918 published 15 September 1966